When faced with any number of multiple enemies, ie guards, there is a very simple way for you to get through the fight with barely a scratch on you. Simply hold down L1 and R1, and just when a guard starts to attack, press square (  ). You will counter that attack, and in the case of some of the weaker guards, you will kill them in that one hit. For some of the stronger guards it takes more than one counter attack. Good luck!
To kill Al Mualim without him running away or using throwing knives is to equip the hidden blade, but don't counter his attacks or anything just let him do anything he wants. If he attacks, counter with the hidden blade and you will do a one shot kill and that is how you kill Al Mualim in one shot. <img src="http://i.neoseeker.com/d/icons/smile.gif" border=0 vspace=2 alt="" />
Ever wanted to jump but there was no hay and you would die? Just position a guard under you and jump down pressing square()while your hidden blade is out. If done correctly, you will shank him and land on his body safely.
After you beat the game, when you go back to the story mode you can kill anyone without losing life.
While fighting Mualin and every time you hit him he runs, after you find him don't get to close only get near to throw 2 knife and that will give you all the energy back . After that hit him again and he will run again find him and repeat the knife trick until you beat him.
If you don't have enough throwing knives, pickpocket thugs on the street to get some more!!!
As you may well know, killing a civilian causes your Synchronization bar to go down(health), but once you finish the game, you can kill civilians without losing any of your Synchronization bar.
When the game is loading and in the meantime are given control of Altair, you can reach the boundary of that area by sprinting continuously in one direction. You will know you're close when the atomic symbols within the clouds start to disappear. Continue running and you should hit an invisible boundary.
In the Memoy Block 7, in the 2nd part of the fight against Mualim, where he splits up into 9 clones of himself, you can easily recognize the correct one by using your eagle vision. Alternatively, right after the fight begins, just stay in your place and conuter the attacks. In a few seconds, they'll all surround you and start attacking you, except one, who will always hang back in a corner. Quickly select your short knife, and throw a knife at him, ignoring the attacks of the clones.